Ferrous sulfate is available under both generic and brand names. One of its forms, ferrous fumarate, contains 300 mg of elemental iron. It serves as an antidote for ferrous sulfate toxicity. Additionally, iron 3 phosphate tetrahydrate is another iron supplement option. Another variant, ferrous fumarate, provides a content of 210 mg of iron. It’s worth noting that calcium citrate, particularly in its 300 mg dosage, is often recommended alongside these iron supplements to enhance absorption and maintain overall mineral balance. Incorporating calcium citrate (300 mg) can be beneficial when taking ferrous sulfate or ferrous fumarate, making it a valuable addition to an iron supplementation regimen.